.small {
    width: 192px;
    height: 192px;
    border-radius: 10px; 
    position: absolute;
    left: 0px;
    top: 0px; 
}

.big {
   
    width: 384px;
    height: 192px;
    
    display: none;
    border-radius: 10px;
}
 .lilb{
    list-style: none;
    float: left;
    position: relative;
    width: 192px;
    height: 192px;
}

.current{
    width: 384px;
}

.current .big {
    display: block;         
}

.current .small {
    display: none;
}
.box3 {
    
    width: 100%;
    height: 192px;
    margin-top: 450px;
    border: 1px dotted pink;
}